A world where there is a finite amount of magic present in the world, and it's almost used up. With the winds of magic being weak and unstable, how will nations built on the heavy use of magic survive?
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A large river that is continuously covered in a thick layer of fog. There will be either a rope ferry to get across or possibly a boat that is rowed across by worshippers of the water elementals. It is very thick fog to the point where it even muffles voices even at close range and visibility even beyond a foot is almost impossible.